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<head>
  <meta charset="UTF-8">
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  <title>Document</title>
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<body>
  <script>
    var largestNumber = function (nums) {
      nums.sort((a, b) => {
        const s1 = a + '' + b
        const s2 = b + '' + a
        return s2 - s1
      })
      return nums[0] ? nums.join('') : '0'
    };
    console.log(largestNumber([10, 2]))
  </script>
</body>

</html>